I downloaded v3.0.3 today on my Samsung S8.  First time connecting via bluetooth after asking for my PIN it asked for username/password, but the keyboard was the numberpad with no way to change it. I switched to another App with a standard QWERTY keyboard and then back to the H9 App and it was OK.

We have a Samsung S8, and I haven't been able to reproduce this problem.  Would you mind double checking whether you're running the latest S8 software?  I'm wondering if maybe an earlier version of the OS on the S8 might have had a bug that was fixed by the latest release?  It's unlikely, but I can't otherwise explain why I'm having such a tough time reproducing this problem.